"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const utils = require("./utils.cjs");
const storageKey = "tsr-scroll-restoration-v1_3";
let sessionsStorage = false;
try {
  sessionsStorage = typeof window !== "undefined" && typeof window.sessionStorage === "object";
} catch {
}
const throttle = (fn, wait) => {
  let timeout;
  return (...args) => {
    if (!timeout) {
      timeout = setTimeout(() => {
        fn(...args);
        timeout = null;
      }, wait);
    }
  };
};
const scrollRestorationCache = sessionsStorage ? (() => {
  const state = JSON.parse(window.sessionStorage.getItem(storageKey) || "null") || {};
  return {
    state,
    // This setter is simply to make sure that we set the sessionStorage right
    // after the state is updated. It doesn't necessarily need to be a functional
    // update.
    set: (updater) => (scrollRestorationCache.state = utils.functionalUpdate(updater, scrollRestorationCache.state) || scrollRestorationCache.state, window.sessionStorage.setItem(
      storageKey,
      JSON.stringify(scrollRestorationCache.state)
    ))
  };
})() : void 0;
const defaultGetScrollRestorationKey = (location) => {
  return location.state.key || location.href;
};
function getCssSelector(el) {
  const path = [];
  let parent;
  while (parent = el.parentNode) {
    path.unshift(
      `${el.tagName}:nth-child(${[].indexOf.call(parent.children, el) + 1})`
    );
    el = parent;
  }
  return `${path.join(" > ")}`.toLowerCase();
}
let ignoreScroll = false;
function restoreScroll(storageKey2, key, behavior, shouldScrollRestoration, scrollToTopSelectors) {
  var _a;
  let byKey;
  try {
    byKey = JSON.parse(sessionStorage.getItem(storageKey2) || "{}");
  } catch (error) {
    console.error(error);
    return;
  }
  const resolvedKey = key || ((_a = window.history.state) == null ? void 0 : _a.key);
  const elementEntries = byKey[resolvedKey];
  ignoreScroll = true;
  (() => {
    if (shouldScrollRestoration && elementEntries) {
      for (const elementSelector in elementEntries) {
        const entry = elementEntries[elementSelector];
        if (elementSelector === "window") {
          window.scrollTo({
            top: entry.scrollY,
            left: entry.scrollX,
            behavior
          });
        } else if (elementSelector) {
          const element = document.querySelector(elementSelector);
          if (element) {
            element.scrollLeft = entry.scrollX;
            element.scrollTop = entry.scrollY;
          }
        }
      }
      return;
    }
    const hash = window.location.hash.split("#")[1];
    if (hash) {
      const hashScrollIntoViewOptions = (window.history.state || {}).__hashScrollIntoViewOptions ?? true;
      if (hashScrollIntoViewOptions) {
        const el = document.getElementById(hash);
        if (el) {
          el.scrollIntoView(hashScrollIntoViewOptions);
        }
      }
      return;
    }
    [
      "window",
      ...(scrollToTopSelectors == null ? void 0 : scrollToTopSelectors.filter((d) => d !== "window")) ?? []
    ].forEach((selector) => {
      const element = selector === "window" ? window : document.querySelector(selector);
      if (element) {
        element.scrollTo({
          top: 0,
          left: 0,
          behavior
        });
      }
    });
  })();
  ignoreScroll = false;
}
function setupScrollRestoration(router, force) {
  const shouldScrollRestoration = force ?? router.options.scrollRestoration ?? false;
  if (shouldScrollRestoration) {
    router.isScrollRestoring = true;
  }
  if (typeof document === "undefined" || router.isScrollRestorationSetup) {
    return;
  }
  router.isScrollRestorationSetup = true;
  ignoreScroll = false;
  const getKey = router.options.getScrollRestorationKey || defaultGetScrollRestorationKey;
  window.history.scrollRestoration = "manual";
  const onScroll = (event) => {
    if (ignoreScroll || !router.isScrollRestoring) {
      return;
    }
    let elementSelector = "";
    if (event.target === document || event.target === window) {
      elementSelector = "window";
    } else {
      const attrId = event.target.getAttribute(
        "data-scroll-restoration-id"
      );
      if (attrId) {
        elementSelector = `[data-scroll-restoration-id="${attrId}"]`;
      } else {
        elementSelector = getCssSelector(event.target);
      }
    }
    const restoreKey = getKey(router.state.location);
    scrollRestorationCache.set((state) => {
      const keyEntry = state[restoreKey] = state[restoreKey] || {};
      const elementEntry = keyEntry[elementSelector] = keyEntry[elementSelector] || {};
      if (elementSelector === "window") {
        elementEntry.scrollX = window.scrollX || 0;
        elementEntry.scrollY = window.scrollY || 0;
      } else if (elementSelector) {
        const element = document.querySelector(elementSelector);
        if (element) {
          elementEntry.scrollX = element.scrollLeft || 0;
          elementEntry.scrollY = element.scrollTop || 0;
        }
      }
      return state;
    });
  };
  if (typeof document !== "undefined") {
    document.addEventListener("scroll", throttle(onScroll, 100), true);
  }
  router.subscribe("onRendered", (event) => {
    const cacheKey = getKey(event.toLocation);
    if (!router.resetNextScroll) {
      router.resetNextScroll = true;
      return;
    }
    restoreScroll(
      storageKey,
      cacheKey,
      router.options.scrollRestorationBehavior || void 0,
      router.isScrollRestoring || void 0,
      router.options.scrollToTopSelectors || void 0
    );
    if (router.isScrollRestoring) {
      scrollRestorationCache.set((state) => {
        state[cacheKey] = state[cacheKey] || {};
        return state;
      });
    }
  });
}
function handleHashScroll(router) {
  if (typeof document !== "undefined" && document.querySelector) {
    const hashScrollIntoViewOptions = router.state.location.state.__hashScrollIntoViewOptions ?? true;
    if (hashScrollIntoViewOptions && router.state.location.hash !== "") {
      const el = document.getElementById(router.state.location.hash);
      if (el) {
        el.scrollIntoView(hashScrollIntoViewOptions);
      }
    }
  }
}
exports.defaultGetScrollRestorationKey = defaultGetScrollRestorationKey;
exports.getCssSelector = getCssSelector;
exports.handleHashScroll = handleHashScroll;
exports.restoreScroll = restoreScroll;
exports.scrollRestorationCache = scrollRestorationCache;
exports.setupScrollRestoration = setupScrollRestoration;
exports.storageKey = storageKey;
//# sourceMappingURL=scroll-restoration.cjs.map